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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CRDTP_FRONTEND_CHANNEL_H_
#define CRDTP_FRONTEND_CHANNEL_H_
#include <cstdint>
#include <memory>
#include "export.h"
#include "serializable.h"
#include "span.h"
namespace crdtp {
// =============================================================================
// FrontendChannel - For sending notifications and responses to protocol clients
// =============================================================================
class CRDTP_EXPORT FrontendChannel {
public:
virtual ~FrontendChannel() = default;
// Sends protocol responses and notifications. The |call_id| parameter is
// seemingly redundant because it's also included in the message, but
// responses may be sent from an untrusted source to a trusted process (e.g.
// from Chromium's renderer (blink) to the browser process), which needs
// to be able to match the response to an earlier request without parsing the
// messsage.
virtual void SendProtocolResponse(int call_id,
std::unique_ptr<Serializable> message) = 0;
virtual void SendProtocolNotification(
std::unique_ptr<Serializable> message) = 0;
// FallThrough indicates that |message| should be handled in another layer.
// Usually this means the layer responding to the message didn't handle it,
// but in some cases messages are handled by multiple layers (e.g. both
// the embedder and the content layer in Chromium).
virtual void FallThrough(int call_id,
span<uint8_t> method,
span<uint8_t> message) = 0;
// Session implementations may queue notifications for performance or
// other considerations; this is a hook for domain handlers to manually flush.
virtual void FlushProtocolNotifications() = 0;
};
} // namespace crdtp
#endif // CRDTP_FRONTEND_CHANNEL_H_
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